Los huevos tardan aproximadamente una semana en eclosionar, produciendo una ninfa. Aunque es importante tener en cuenta que las infestaciones de piojos pueden ocurrirle a cualquier persona, algunas personas tienen un mayor riesgo de entrar en contacto con los piojos. A diferencia de su primo, los piojos del cuerpo, o Pediculus humanus humanus, los piojos de la cabeza no son portadores de enfermedades. Los piojos de la cabeza deben alimentarse de otro cuerpo vivo para sobrevivir.

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Pubic lice on the abdomen Pubic lice on the eyelashes The main symptom is itching , usually in the pubic-hair area, resulting from hypersensitivity to louse saliva, which can become stronger over two or more weeks following initial infestation.

As with most sexually transmitted pathogens, they can only survive a short time away from the warmth and humidity of the human body. Infestation in a young child or teenager may indicate sexual abuse.

Nits are lice eggs. They can be hard to see and are found firmly attached to the hair shaft. They are oval and usually yellow to white. Pubic lice nits take about 6—10 days to hatch. The nymph is an immature louse that hatches from the nit egg. A nymph looks like an adult pubic louse but it is smaller. Pubic lice nymphs take about 2—3 weeks after hatching to mature into adults capable of reproducing. To live, a nymph must feed on blood. The adult pubic louse resembles a miniature crab when viewed through a strong magnifying glass.

Pubic lice have six legs; their two front legs are very large and look like the pincher claws of a crab - thus the nickname "crabs. Females lay nits and are usually larger than males. If the louse falls off a person, it dies within 1—2 days. Pubic lice Pthirus pubis have three stages: egg, nymph and adult. Eggs nits are laid on a hair shaft.

Females will lay approximately 30 eggs during their 3—4 week life span. Eggs hatch after about a week and become nymphs, which look like smaller versions of the adults.

The nymphs undergo three molts before becoming adults. Adults are 1. They are much broader in comparison to head and body lice. Adults are found only on the human host and require human blood to survive.

Pubic lice are transmitted from person to person most-commonly via sexual contact, although fomites bedding, clothing may play a minor role in their transmission. A magnifying glass or a stereo-microscope can be used for identification. These products are available over-the-counter without a prescription at a local drug store or pharmacy.

A second round of treatment is recommended within the following seven to ten days to kill newly hatched nymphs. A second treatment is occasionally required if not improved after 3 to 7 days. Therefore, all partners with whom the patient has had sexual contact within the previous 30 days should be evaluated and treated, and sexual contact should be avoided until all partners have successfully completed treatment and are thought to be cured.

Because of the strong association between the presence of pubic lice and classic sexually transmitted infections STIs , patients may be diagnosed with other STIs. Because the crab louse can attach its eggs to the very base of the hair shaft just beneath the surface of the skin, shaving the pubic area is not enough to eliminate an infestation. However, waxing might be effective, since it pulls the hair out by the root—however this has not been tested. The eyelids should be checked as well and treated accordingly.

Infections of the eyelashes may be treated with either petroleum jelly applied twice daily for 10 days or malathion , phenothrin , and carbaryl. Accurate numbers are difficult to acquire, because pubic lice infestations are not considered a reportable condition by many governments.

Many cases are self-treated or treated discreetly by personal physicians, which further adds to the difficulty of producing accurate statistics. Especially in male patients, pubic lice and eggs can also be found in hair on the abdomen and under the armpits, as well as on the beard and mustache, while in children they are usually found in eyelashes.

It has recently been suggested that an increasing percentage of humans removing their pubic hair has led to reduced crab louse populations in some parts of the world.


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